JP2002313635A - Method of managing gap of inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the management of the gap between a drum core and a ring core at the time of assembling an inductor. SOLUTION: Projections 17 are provided on either the external side face of the upper flange section 13b of the drum core 13 or the internal side face of the ring core 14, so that the projections 17 may form a first gap G1 when the projections 17 come into contact with the other side face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for managing a gap of an inductor, and more particularly to a method for managing a core gap for obtaining an optimum inductance and a rated current.

[0002]

FIG. 5 shows a general inductor 1 mounted on the surface of a circuit board. A ring core 4 is arranged outside a drum core 3 around which a coil 2 is wound. I have. The drum core 3 has a trunk 3a.
And an upper flange 3b and a lower flange 3c integrally formed above and below the body 3a. The lower flange 3c has a larger diameter than the upper flange 3b.

On the other hand, the upper and lower surfaces of the ring core 4 are open, and the outer diameter of the ring core 4 is formed so as to substantially match the outer dimension of the lower flange 3c of the drum core. The outer surface of the upper flange portion 3b of the drum core and the ring core 4
Together with the first provide a gap G ₁ between the inner surface, the second gap G ₂ is provided between the upper surface outer peripheral portion and the lower end surface of the ring core 4 of the lower flange portion 3c of the drum core, drum core 3 And the ring core 4 are fixed.

The gaps G ₁ and G ₂ are necessary to obtain good saturation characteristics by leaking a part of the magnetic flux to the outside. However, if the gap length is too large, the initial absolute value of the inductance decreases. Thus, in the inductor 1 to obtain an optimum inductance and rated current, the gap G ₁ and G ₂ have to correctly manage whether assembled as designed.

Conventionally, when assembling the inductor 1,
Spacers 5 are provided between the outer surface of the upper flange 3b of the drum core and the inner surface of the ring core 4 and between the outer peripheral edge of the upper surface of the lower flange 3c of the drum core and the lower surface of the ring core 4, respectively.
6 and interposed, thereby suppressing variations in the gap G ₁ and G _2. Alternatively, the drum core 3 and the ring core 4 are positioned by a jig, and the gaps G ₁ and G ₂ are managed so as to be designed values.

However, when the spacer is interposed, the number of assembling steps increases, and when a jig is used, the cost increases in terms of equipment. In addition, as shown in FIG. 6, the drum core 3 and the ring core 4 may be rotated or displaced, so that the gap management and the displacement management for each individual product are complicated.

[0007] Therefore, there is a technical problem to be solved in order to simplify the management of the gap between the drum core and the ring core when assembling the inductor, and an object of the present invention is to solve this problem.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been proposed to achieve the above object, and is an inductor having a ring core disposed outside a drum core around which a coil is wound. A first gap provided between an outer side surface of the upper flange portion and an inner side surface of the ring core; and a first gap provided between the outer side surface of the upper flange portion and the inner side surface of the ring core. In a second gap management method provided between the upper peripheral edge and the lower end surface of the ring core,
A gap management method for an inductor, wherein a projection is provided on one of an outer surface of the upper flange portion and an inner surface of the ring core, and the projection abuts on the other surface to form a first gap. And an inductor having a ring core disposed outside a drum core around which a coil is wound, wherein the drum core of the inductor is provided with an upper flange portion and a lower flange portion having a diameter larger than that of the upper flange portion. The first gap provided between the outer surface of the flange portion and the inner surface of the ring core and the second gap provided between the outer peripheral edge of the upper surface of the lower flange and the lower end surface of the ring core. In this case, a projection is provided on one of the outer peripheral edge of the upper surface of the lower flange and the lower end of the ring core, and the projection abuts on the other surface to form a second gap. Inductor gap management method The concave portion is provided on the other surface of the protruding portion abuts, the protrusion is engaged with the recess, it is to provide an inductor of gap management method so as to prevent displacement between the drum core and the ring core.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In FIGS. 1 and 2,
The inductor 11 is a drum core 1 around which a coil 12 is wound.
The ring core 14 is disposed outside the ring 3. The drum core 13 includes a body 13a, an upper flange 13b and a lower flange 13c integrally formed above and below the body 13a,
The lower flange 13c has a larger diameter than the upper flange 13b.

On the other hand, the upper and lower surfaces of the ring core 14 are open, and the outer diameter of the ring core 14 is formed so as to substantially match the outer dimensions of the lower flange 13c of the drum core. Then, a projection is provided on one of the outer surface of the upper flange portion 13b of the drum core and the inner surface of the ring core 14. In the present embodiment, a plurality of protrusions 17, 17,... Are provided at appropriate intervals on the outer surface of the upper flange portion 13b of the drum core as the one surface. Therefore, the protrusion 1
7, 17,... Are in contact with the inner surface of the ring core 14, which is the other surface, to form a _first gap G1 between the outer surface of the upper flange portion 13b of the drum core and the inner surface of the ring core 14. .

Also, a projection is provided on one of the outer peripheral edge of the upper surface of the lower flange portion 13c of the drum core and the lower end surface of the ring core 14. In the present embodiment, a plurality of projections 18, 18,... Are provided on the lower end surface of the ring core 14 as the one surface at appropriate intervals. Therefore, the protrusion 1
The lower flange portion 13c of the drum core in which 8, 18,...
The upper flange 13c of the drum core is brought into contact with the outer peripheral edge of the upper surface of the drum core.
Between the outer peripheral edge of the upper surface of the
Of forming a gap G _2. The projection 18 may be provided on the outer peripheral edge of the upper surface of the lower flange portion 13c of the drum core, but for example, since the coil is wound around this portion, the projection 1
Since the formation position of 8 is limited, it is preferable that the projection 18 is formed on the lower end surface of the ring core 14.

As described above, by providing the protrusion 17 or 18 on the drum core 13 or the ring core 14,
The gaps G ₁ and G ₂ corresponding to the sizes of the projections 17 and 18 can be obtained simply by combining both cores, and the inductor 11 can be simply and accurately formed without using a spacer or a jig as in the related art. Gap management can be performed.

As shown in FIGS. 3 and 4, a plurality of projections 17, 17... Are provided at appropriate intervals on the outer surface of the upper flange portion 13b of the drum core. .. May be provided on the side surface at intervals corresponding to the protrusions 17, 17. In such a case, the projections 17, 17,... Engage with the recesses 19, 19,.

A plurality of projections 18, 18,... Are provided on the lower end surface of the ring core 14 at appropriate intervals.
The recesses 20, 20,... May be provided at intervals corresponding to the protrusions 18, 18,. In this case, the projections 18, 18,... Engage with the recesses 20, 20,.

[0015] In this embodiment, the first managing the gap G ₁ provided with a protruding portion 17 between the outer surface and the inner surface of the ring core 14 on the flange portion 13b of the drum core, under the drum core flange A projection 18 is provided between the outer peripheral edge of the upper surface of the portion 13c and the lower end surface of the ring core 14 to form a second gap G _2.
However, it is not always necessary to manage both gaps at the protrusions, and the first gap G ₁ or the second gap G ₁
Only either one of the gap G ₂ was controlled by the protrusion, the other gap may be managed like as in the conventional spacer.

Thus, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0017]

As described in detail in the above embodiment, the present invention according to claim 1 is characterized in that the projection is formed on one of the outer surface of the upper flange portion of the drum core and the inner surface of the ring core. Is provided, and the first abutment is formed by the protrusion abutting on the other surface, so that it is not necessary to interpose a spacer or use a jig as in the related art, and the gap between the drum core and the ring core is reduced. It can be formed accurately and easily.

According to a second aspect of the present invention, a projection is provided on one of an outer peripheral edge of an upper surface of a lower flange portion of a drum core and a lower end surface of a ring core, and the projection abuts on the other surface. 2
Thus, the same effect as that of the first aspect can be obtained.

According to the third aspect of the present invention, the concave portion is provided on the other surface with which the projection portion comes into contact, and the projection portion is engaged with the concave portion, so that the displacement between the drum core and the ring core is prevented. be able to.

Thus, the gap management of the inductor is simplified, and the number of production steps and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of an inductor according to an embodiment of the present invention, in which a projection is provided between a drum core and a ring core to form a gap.

FIG. 2 shows one embodiment of the present invention, and is a longitudinal sectional front view of an inductor in which a projection is provided between a drum core and a ring core to form a gap.

FIG. 3 is a plan view of the inductor according to the embodiment of the present invention, in which a projection and a recess are provided between a drum core and a ring core to form a gap.

FIG. 4 is a longitudinal sectional front view of the inductor according to the embodiment of the present invention, in which a gap is formed by providing a protrusion and a recess between a drum core and a ring core;

FIG. 5 is a vertical sectional front view of a conventional inductor.

FIG. 6 is a plan view of an inductor whose rotation has been shifted;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Inductor 12 Coil 13 Drum core 13a Body 13b Upper flange 13c Lower flange 14 Ring core 17, 18 Projection 19, 20 Recess

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tadashi Nakahara 1049 Oda, Tateiwa-shi, Iizuka-shi, Fukuoka F-term in Kyushu Mitsumi Corporation (reference) 5E070 AA01 DB06

Claims (3)

[Claims] 1. An inductor having a ring core disposed outside a drum core around which a coil is wound, wherein the drum core of the inductor is provided with an upper flange portion and a lower flange portion having a larger diameter than the upper flange portion. Management of a first gap provided between an outer surface of the upper flange and an inner surface of the ring core and a second gap provided between an outer peripheral edge of an upper surface of the lower flange and a lower end of the ring core. In the method, a protrusion is provided on one of the outer surface of the upper collar portion and the inner surface of the ring core, and the protrusion contacts the other surface to form a first gap. A gap management method for an inductor, comprising: 2. An inductor having a ring core disposed outside a drum core around which a coil is wound, wherein the drum core of the inductor is provided with an upper flange portion and a lower flange portion having a diameter larger than that of the upper flange portion. Management of a first gap provided between an outer surface of the upper flange and an inner surface of the ring core and a second gap provided between an outer peripheral edge of an upper surface of the lower flange and a lower end of the ring core. In the method, a protrusion may be provided on one of the outer peripheral edge of the upper surface of the lower flange portion and the lower end surface of the ring core, and the protrusion may contact the other surface to form a second gap. A gap management method for an inductor, comprising: 3. The device according to claim 1, wherein a concave portion is provided on the other surface with which the projecting portion abuts, and the projecting portion is engaged with the concave portion to prevent the drum core from being displaced from the ring core.
Or the gap management method of the inductor according to 2.